net/6lowpan/debugfs.c

   1 /* This program is free software; you can redistribute it and/or modify
   2  * it under the terms of the GNU General Public License version 2
   3  * as published by the Free Software Foundation.
   4  *
   5  * This program is distributed in the hope that it will be useful,
   6  * but WITHOUT ANY WARRANTY; without even the implied warranty of
   7  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   8  * GNU General Public License for more details.
   9  *
  10  * Authors:
  11  * (C) 2015 Pengutronix, Alexander Aring <aar@pengutronix.de>
  12  * Copyright (c)  2015 Nordic Semiconductor. All Rights Reserved.
  13  */
  14
  15 #include <net/6lowpan.h>
  16
  17 #include "6lowpan_i.h"
  18
  19 #define LOWPAN_DEBUGFS_CTX_PFX_NUM_ARGS 8
  20
  21 static struct dentry *lowpan_debugfs;
  22
  23 static int lowpan_ctx_flag_active_set(void *data, u64 val)
  24 {
  25         struct lowpan_iphc_ctx *ctx = data;
  26
  27         if (val != 0 && val != 1)
  28                 return -EINVAL;
  29
  30         if (val)
  31                 set_bit(LOWPAN_IPHC_CTX_FLAG_ACTIVE, &ctx->flags);
  32         else
  33                 clear_bit(LOWPAN_IPHC_CTX_FLAG_ACTIVE, &ctx->flags);
  34
  35         return 0;
  36 }
  37
  38 static int lowpan_ctx_flag_active_get(void *data, u64 *val)
  39 {
  40         *val = lowpan_iphc_ctx_is_active(data);
  41         return 0;
  42 }
  43
  44 DEFINE_SIMPLE_ATTRIBUTE(lowpan_ctx_flag_active_fops,
  45                         lowpan_ctx_flag_active_get,
  46                         lowpan_ctx_flag_active_set, "%llu\n");
  47
  48 static int lowpan_ctx_flag_c_set(void *data, u64 val)
  49 {
  50         struct lowpan_iphc_ctx *ctx = data;
  51
  52         if (val != 0 && val != 1)
  53                 return -EINVAL;
  54
  55         if (val)
  56                 set_bit(LOWPAN_IPHC_CTX_FLAG_COMPRESSION, &ctx->flags);
  57         else
  58                 clear_bit(LOWPAN_IPHC_CTX_FLAG_COMPRESSION, &ctx->flags);
  59
  60         return 0;
  61 }
  62
  63 static int lowpan_ctx_flag_c_get(void *data, u64 *val)
  64 {
  65         *val = lowpan_iphc_ctx_is_compression(data);
  66         return 0;
  67 }
  68
  69 DEFINE_SIMPLE_ATTRIBUTE(lowpan_ctx_flag_c_fops, lowpan_ctx_flag_c_get,
  70                         lowpan_ctx_flag_c_set, "%llu\n");
  71
  72 static int lowpan_ctx_plen_set(void *data, u64 val)
  73 {
  74         struct lowpan_iphc_ctx *ctx = data;
  75         struct lowpan_iphc_ctx_table *t =
  76                 container_of(ctx, struct lowpan_iphc_ctx_table, table[ctx->id]);
  77
  78         if (val > 128)
  79                 return -EINVAL;
  80
  81         spin_lock_bh(&t->lock);
  82         ctx->plen = val;
  83         spin_unlock_bh(&t->lock);
  84
  85         return 0;
  86 }
  87
  88 static int lowpan_ctx_plen_get(void *data, u64 *val)
  89 {
  90         struct lowpan_iphc_ctx *ctx = data;
  91         struct lowpan_iphc_ctx_table *t =
  92                 container_of(ctx, struct lowpan_iphc_ctx_table, table[ctx->id]);
  93
  94         spin_lock_bh(&t->lock);
  95         *val = ctx->plen;
  96         spin_unlock_bh(&t->lock);
  97         return 0;
  98 }
  99
 100 DEFINE_SIMPLE_ATTRIBUTE(lowpan_ctx_plen_fops, lowpan_ctx_plen_get,
 101                         lowpan_ctx_plen_set, "%llu\n");
 102
 103 static int lowpan_ctx_pfx_show(struct seq_file *file, void *offset)
 104 {
 105         struct lowpan_iphc_ctx *ctx = file->private;
 106         struct lowpan_iphc_ctx_table *t =
 107                 container_of(ctx, struct lowpan_iphc_ctx_table, table[ctx->id]);
 108
 109         spin_lock_bh(&t->lock);
 110         seq_printf(file, "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x\n",
 111                    be16_to_cpu(ctx->pfx.s6_addr16[0]),
 112                    be16_to_cpu(ctx->pfx.s6_addr16[1]),
 113                    be16_to_cpu(ctx->pfx.s6_addr16[2]),
 114                    be16_to_cpu(ctx->pfx.s6_addr16[3]),
 115                    be16_to_cpu(ctx->pfx.s6_addr16[4]),
 116                    be16_to_cpu(ctx->pfx.s6_addr16[5]),
 117                    be16_to_cpu(ctx->pfx.s6_addr16[6]),
 118                    be16_to_cpu(ctx->pfx.s6_addr16[7]));
 119         spin_unlock_bh(&t->lock);
 120
 121         return 0;
 122 }
 123
 124 static int lowpan_ctx_pfx_open(struct inode *inode, struct file *file)
 125 {
 126         return single_open(file, lowpan_ctx_pfx_show, inode->i_private);
 127 }
 128
 129 static ssize_t lowpan_ctx_pfx_write(struct file *fp,
 130                                     const char __user *user_buf, size_t count,
 131                                     loff_t *ppos)
 132 {
 133         char buf[128] = {};
 134         struct seq_file *file = fp->private_data;
 135         struct lowpan_iphc_ctx *ctx = file->private;
 136         struct lowpan_iphc_ctx_table *t =
 137                 container_of(ctx, struct lowpan_iphc_ctx_table, table[ctx->id]);
 138         int status = count, n, i;
 139         unsigned int addr[8];
 140
 141         if (copy_from_user(&buf, user_buf, min_t(size_t, sizeof(buf) - 1,
 142                                                  count))) {
 143                 status = -EFAULT;
 144                 goto out;
 145         }
 146
 147         n = sscanf(buf, "%04x:%04x:%04x:%04x:%04x:%04x:%04x:%04x",
 148                    &addr[0], &addr[1], &addr[2], &addr[3], &addr[4],
 149                    &addr[5], &addr[6], &addr[7]);
 150         if (n != LOWPAN_DEBUGFS_CTX_PFX_NUM_ARGS) {
 151                 status = -EINVAL;
 152                 goto out;
 153         }
 154
 155         spin_lock_bh(&t->lock);
 156         for (i = 0; i < 8; i++)
 157                 ctx->pfx.s6_addr16[i] = cpu_to_be16(addr[i] & 0xffff);
 158         spin_unlock_bh(&t->lock);
 159
 160 out:
 161         return status;
 162 }
 163
 164 static const struct file_operations lowpan_ctx_pfx_fops = {
 165         .open           = lowpan_ctx_pfx_open,
 166         .read           = seq_read,
 167         .write          = lowpan_ctx_pfx_write,
 168         .llseek         = seq_lseek,
 169         .release        = single_release,
 170 };
 171
 172 static int lowpan_dev_debugfs_ctx_init(struct net_device *dev,
 173                                        struct dentry *ctx, u8 id)
 174 {
 175         struct lowpan_dev *ldev = lowpan_dev(dev);
 176         struct dentry *dentry, *root;
 177         char buf[32];
 178
 179         WARN_ON_ONCE(id > LOWPAN_IPHC_CTX_TABLE_SIZE);
 180
 181         sprintf(buf, "%d", id);
 182
 183         root = debugfs_create_dir(buf, ctx);
 184         if (!root)
 185                 return -EINVAL;
 186
 187         dentry = debugfs_create_file("active", 0644, root,
 188                                      &ldev->ctx.table[id],
 189                                      &lowpan_ctx_flag_active_fops);
 190         if (!dentry)
 191                 return -EINVAL;
 192
 193         dentry = debugfs_create_file("compression", 0644, root,
 194                                      &ldev->ctx.table[id],
 195                                      &lowpan_ctx_flag_c_fops);
 196         if (!dentry)
 197                 return -EINVAL;
 198
 199         dentry = debugfs_create_file("prefix", 0644, root,
 200                                      &ldev->ctx.table[id],
 201                                      &lowpan_ctx_pfx_fops);
 202         if (!dentry)
 203                 return -EINVAL;
 204
 205         dentry = debugfs_create_file("prefix_len", 0644, root,
 206                                      &ldev->ctx.table[id],
 207                                      &lowpan_ctx_plen_fops);
 208         if (!dentry)
 209                 return -EINVAL;
 210
 211         return 0;
 212 }
 213
 214 static int lowpan_context_show(struct seq_file *file, void *offset)
 215 {
 216         struct lowpan_iphc_ctx_table *t = file->private;
 217         int i;
 218
 219         seq_printf(file, "%3s|%-43s|%c\n", "cid", "prefix", 'C');
 220         seq_puts(file, "-------------------------------------------------\n");
 221
 222         spin_lock_bh(&t->lock);
 223         for (i = 0; i < LOWPAN_IPHC_CTX_TABLE_SIZE; i++) {
 224                 if (!lowpan_iphc_ctx_is_active(&t->table[i]))
 225                         continue;
 226
 227                 seq_printf(file, "%3d|%39pI6c/%-3d|%d\n", t->table[i].id,
 228                            &t->table[i].pfx, t->table[i].plen,
 229                            lowpan_iphc_ctx_is_compression(&t->table[i]));
 230         }
 231         spin_unlock_bh(&t->lock);
 232
 233         return 0;
 234 }
 235
 236 static int lowpan_context_open(struct inode *inode, struct file *file)
 237 {
 238         return single_open(file, lowpan_context_show, inode->i_private);
 239 }
 240
 241 static const struct file_operations lowpan_context_fops = {
 242         .open           = lowpan_context_open,
 243         .read           = seq_read,
 244         .llseek         = seq_lseek,
 245         .release        = single_release,
 246 };
 247
 248 int lowpan_dev_debugfs_init(struct net_device *dev)
 249 {
 250         struct lowpan_dev *ldev = lowpan_dev(dev);
 251         struct dentry *contexts, *dentry;
 252         int ret, i;
 253
 254         /* creating the root */
 255         ldev->iface_debugfs = debugfs_create_dir(dev->name, lowpan_debugfs);
 256         if (!ldev->iface_debugfs)
 257                 goto fail;
 258
 259         contexts = debugfs_create_dir("contexts", ldev->iface_debugfs);
 260         if (!contexts)
 261                 goto remove_root;
 262
 263         dentry = debugfs_create_file("show", 0644, contexts,
 264                                      &lowpan_dev(dev)->ctx,
 265                                      &lowpan_context_fops);
 266         if (!dentry)
 267                 goto remove_root;
 268
 269         for (i = 0; i < LOWPAN_IPHC_CTX_TABLE_SIZE; i++) {
 270                 ret = lowpan_dev_debugfs_ctx_init(dev, contexts, i);
 271                 if (ret < 0)
 272                         goto remove_root;
 273         }
 274
 275         return 0;
 276
 277 remove_root:
 278         lowpan_dev_debugfs_exit(dev);
 279 fail:
 280         return -EINVAL;
 281 }
 282
 283 void lowpan_dev_debugfs_exit(struct net_device *dev)
 284 {
 285         debugfs_remove_recursive(lowpan_dev(dev)->iface_debugfs);
 286 }
 287
 288 int __init lowpan_debugfs_init(void)
 289 {
 290         lowpan_debugfs = debugfs_create_dir("6lowpan", NULL);
 291         if (!lowpan_debugfs)
 292                 return -EINVAL;
 293
 294         return 0;
 295 }
 296
 297 void lowpan_debugfs_exit(void)
 298 {
 299         debugfs_remove_recursive(lowpan_debugfs);
 300 }